package com.example.community.controller;

import com.example.community.entity.User;
import com.example.community.service.UserService;
import com.example.community.utils.CommunityConstant;
import com.google.code.kaptcha.Producer;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.CookieValue;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.imageio.ImageIO;
import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.awt.image.BufferedImage;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Map;

/**
 *
 */
@Controller
public class LoginController implements CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(LoginController.class);

    @Autowired
    private UserService userService;

    @Autowired
    private Producer kaptchaProducer;

    @Value("${server.servlet.context-path}")
    private String contextPath;


    @RequestMapping(path = "/register", method = RequestMethod.GET)
    public String getRegisterPage(){
        return "/site/register";
    }
    @RequestMapping(path = "/login", method = RequestMethod.GET)
    public String getLoginPage(){
        return "/site/login";
    }

    @RequestMapping(path="/register", method = RequestMethod.POST)
    public String register(Model model, User user){
        //前端传入值和user对象的属性像匹配的时候, SpringMVC会根据我们要求的输入,
        // 自动注入生成一个user对象, 同样的, 当我们返回一个地址的时候,
        // 在这个页面可以通过model来获取user, 它被自动绑定进去了
        Map<String, Object> map = userService.register(user);
        if(map == null || map.isEmpty()){
            model.addAttribute("msg", "注册成功, 已向您的邮箱发送一份激活邮件");
            model.addAttribute("target", "/index");
            //这两个塞进model中的是为了给operate取的
            return "/site/operate-result";
        }else{
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            model.addAttribute("emailMsg", map.get("emailMsg"));
            return "/site/register";
        }

    }

    @RequestMapping(path = "/activation/{userId}/{code}", method = RequestMethod.GET)
    public String activation(Model model, @PathVariable("userId") int userId, @PathVariable("code") String code){
        int result = userService.activation(userId, code);
        if(result == ACTIVATION_SUCCESS){
            model.addAttribute("msg", "激活成功");
            model.addAttribute("target", "/login");
        }else if(result == ACTIVATION_REPEAT){
            model.addAttribute("msg", "请勿重复激活");
            model.addAttribute("target", "/index");
        }else{
            model.addAttribute("msg", "激活失败, 激活码不正确");
            model.addAttribute("target", "/index");
        }
        return "/site/operate-result";
    }

    //生成验证码
    @RequestMapping(path="/kaptcha", method = RequestMethod.GET)
    public void getKaptcha(HttpServletResponse response, HttpSession session){
        //生成验证码, 验证码数据放在服务器端
        String text = kaptchaProducer.createText();
        BufferedImage image = kaptchaProducer.createImage(text);
        //将验证码存入session
        session.setAttribute("kaptcha", text);
        //将图片输出给浏览器
        response.setContentType("image/png");
        try {
            OutputStream os = response.getOutputStream();
            ImageIO.write(image, "png", os);
            //response由SpringMVC来维护, 会自己关闭
        } catch (IOException e) {
            logger.error("响应验证码失败" + e.getMessage());
        }
    }

    //可以是两个相同的path, 但是method不同就可以
    @RequestMapping(path="/login", method = RequestMethod.POST)
    public String login(String username, String password, String code, boolean rememberme,
                        Model model, HttpSession session, HttpServletResponse response){
        String kaptcha = (String)session.getAttribute("kaptcha");
        if(StringUtils.isBlank(kaptcha) || StringUtils.isBlank(code) || !kaptcha.equalsIgnoreCase(code)){
            model.addAttribute("codeMsg", "验证码不正确");
            return "/site/login";
        }
        //检查账号密码, 登录成功就把cookie发送给客户端, 不成功则在model中填上错误信息
        int expiredSeconds = rememberme? REMEMBER_EXPIRED_SECONDS : DEFAULT_EXPIRED_SECONDS;
        Map<String, Object> map = userService.login(username, password, expiredSeconds);
        if(map.containsKey("ticket")){
            Cookie cookie = new Cookie("ticket", map.get("ticket").toString());
            cookie.setPath(contextPath);
            cookie.setMaxAge(expiredSeconds);
            response.addCookie(cookie);
            return "redirect:/index";
        }else{
            model.addAttribute("usernameMsg", map.get("usernameMsg"));
            model.addAttribute("passwordMsg", map.get("passwordMsg"));
            return "/site/login";
        }
    }

    @RequestMapping(path = "/logout", method = RequestMethod.GET)
    public String logout(@CookieValue("ticket") String ticket){
        userService.logout(ticket);
        return "redirect:/login";
    }
}
